Dresden 2017 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 25: Posters - Soft Particles, Microswimmers, Microfluidics

DY 25.16: Poster

Tuesday, March 21, 2017, 18:15–21:00, P3

Hydrodynamic ratchet — •František Slanina — Institute of Physics ASCR, Na Slovance 2, CZ-18221 Prague, Czech Republic

We investigate analytically a microfluidic device consisting of a tube with a nonuniform but spatially periodic diameter, where a fluid driven back and forth by a pump carries colloidal particles. Although the net flow of the fluid is zero, the particles move preferentially in one direction due to the ratchet mechanism, which occurs due to the simultaneous effect of inertial hydrodynamics and Brownian motion. We show that the average current is strongly sensitive to particle size, thus facilitating colloidal particle sorting.